Thessalonica, now known as Thessaloniki, is the second-largest city in Greece and serves as a major economic and cultural hub. Founded in 315 BC, it was named after the half-sister of Alexander the Great. The city has a rich history, influenced by various civilizations, including the Romans, Byzantines, and Ottomans. Today, Thessalonica is known for its vibrant atmosphere, historical sites, and beautiful waterfront. Key attractions include the White Tower, the Rotunda, and the Arch of Galerius. The city also hosts numerous festivals and events, reflecting its diverse cultural heritage and modern lifestyle.